RichThesaurus
downhearted
vs
unfelicitous
downhearted
adj
Sad, discouraged, in low spirits, unhappy, having no hope
unfelicitous
adj
Not felicitous; unhappy, unfortunate.
How often have the words
downhearted
and
unfelicitous
occurred in a corpus of books?
(source:
Google Ngram Viewer
)